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Finding the Fourth Proportional to 1,382.49, 1,909.49 and 1,008.87

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Solution

The fourth proportional to 1,382.49, 1,909.49 and 1,008.87 is: 1,393.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.49 : 1,909.49 = 1,008.87 : x
  2. Step 2: Convert to fraction form
    1,382.49/1,909.49 = 1,008.87/x
  3. Step 3: Cross multiply
    1,382.49x = 1,909.49 × 1,008.87
  4. Step 4: Simplify right side
    1,382.49x = 1,926,422.13
  5. Step 5: Solve for x
    x = 1,926,422.13/1,382.49
  6. Step 6: Final answer
    x = 1,393.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.